Woodworking attachment for drill motors



April 16, 1957 c. E. JONES WOODWORKING ATTACHMENT FOR DRILL MOTORS FiledOct. 17, 1955 2 Sheets-Sheet l cHALQLEs 5-. JONES INVENTOR.

ATTORN EY April 16, 1957 c. E. JONES 2,788,810

WOODWORKING ATTACHMENT FOR DRILL MOTORS Filed Oct. 17, 1955 2Sheets-Sheet 2 Mates 2. m

IN VEN TOR.

ATTORNE United States Patent WOODWORKING ATTACHMENT FOR DRILL MOTORSCharles E. Jones, Longton, Kans.

Application October 17, 1955, Serial No. 540,662

3 Claims. (Cl. 143-43) This invention relates to woodworking tools andpertains more particularly to an attachment or device capable of beingdriven by an ordinary drill motor in the performance of a plurality ofdifferent carpentry operations.

Various attachments have been devised for use with drill motors and themajority of these attachments, once they have been adjusted, functionfairly well as far as their specific or single purpose is concerned.However, there remains a need for a more versatile attachment of amulti-purpose character which will permit its use wherever a number ofcommonly required work functions are to be effected. For example, theinvention envisages the achievement of sawing, planing and sandingoperations with a single basic attachment, only replacement of theparticular tool mechanism supported by the frame of the attachmenthaving to be made where particular circumstances dictate.

Not only has the invention the object of providing a universalattachment as outlined above, but it has for an added object the facileadjustment of the respective tools as to their bite without resort toexpensive and complicated mechanisms. In this regard, it is to be alsopointed out that another aim of the invention is to provide alightweight attachment of a portable nature which will be rugged andlong lasting.

A further object of the invention is to provide an attachment of theforegoing character in which the various possible adjustments aremaintained fast once they have been made, even when the attachment issubjected to considerable vibration.

Also, the invention comprehends a quick shifting of the handle gripthrough 180 degrees from opposite location to the other, thereby makingit possible for the attachment to be operated from either end, dependingupon which end is more convenient at that particular moment.

Other objects will be in part obvious and in part pointed out more indetail hereinafter. v

The invention accordingly consists in the features of construction,combination of elements and arrangement of parts which will beexemplified in the construction hereafter set forth and the scope of theapplication which will be indicated in the appended claims.

In the drawings:

Figure 1 is a top plan view of the attachment illustrating theinvention;

Figure 2 is a side elevational view of the attachment;

Figure 3 is an end view of the attachment when seen from the right;

Figure 4 is a sectional view taken in the direction of line 4-4 ofFigure 2;

Figure 5 is a sectional view taken in the direction of line 5-5 ofFigure 1.

Referring to Figures 1-5 the attachment there shown comprises a baseplate having a transverse slot 12 and a longitudinal slot 14. Integralwith the base plate 10 is an upstanding side wall 16 provided with acylindrical aperture 18 (Figure 5) extending transversely therethrough.For the purpose of strengthening the other scribed is intended forsawing operations.

side of the base plate 10 a U-shaped rod 20 has its ends anchored toportions of the plate on either side of the slot 12. Rod 20 also servesas a guard.

The aperture 18 accommodates in the present instance a saw mechanism orsub-assembly 22 which includes a cylindrical barrel 24 (Figs. 3, 4 and5) capable of being inserted into the aperture 18. Within the barrel 24is eccentrically journaled a shaft 26, the shaft being supported byflanged sleeve bearings 28, 29 disposed at either end of a bore 30extending completely through the barrel. A projecting spindle end 32,actually a reduced diameter portion of the shaft 26, serves as a meansby which the shaft may be rotatively connected to the chuck of aconventional drill motor (not shown).

As may be seen from the sectional make-up pictured in Figure 4, there isa pair of cup-shaped washer elements 34, 36 circumscribed about thespindle 32. The element 34 is prevented from moving toward the left by alock member 38 received in an annular groove formed on the spindle 32.Interposed between the two washers 34, 36 is a coil spring 40 whichexerts a pressural action against the washer 36 and hence the flange ofthe left bearing 28, the washer 34 absorbing the spring reaction andthus causing a flange 42 at the other end of the shaft 26 to bearagainst the flange of the right bearing 29 (Figure 4). In this way theshaft 26 is prevented from shifting axially when rotating owing to thethrust bearing arrangement above described.

As already explained, the mechanism now being de- Accordingly, a disctype saw member 44 is mounted on the shaft 26 for rotation therewith,there being a screw 46 threaded into the shaft for this purpose. Asindicated in phantom outline at 48, the saw disc is susceptible'to beingof Whatever diameter is found necessary for agiven sawing job. Also,while saw discs of various diameters may be substituted one for theother merely by removing the screw 46, nonetheless provision is made forfacile adjustment of the depth of cut by simply turning the barrel 24relative to its aperture 18. To this end, it will be observed fromFigure 5 that the bore 30 extending through the barrel 24 is oflfsetfrom the barrels centerline. By reason of this eccentricity, the sawdisc 44 can be moved relative to the base plate 10 and the depth of itsout accordingly governed.

Attention is now directed to the unique handle construction presented bythe invention and the role it plays in assuring that the barrel 24 willremain in whatever preferred angular condition into which it is turned.As best seen in Figure 5, the handle assembly includes a shank 50received in a longitudinal aperture 52 formed in the side Wall 16. Theshank is of sufficient length so that both ends thereof project from theside Wall 16, there being an indentation or recess 54 in each exposedportion. Either indentation 54 may be employed for the attachment of ahandle grip unit 56 comprising a grip 58, a grip shank 60, a tubularbushing 62 aflixed to the shank 60 by a pin 64 (Figure 5) and a thumb orset screw 66 threaded radially into the bushing 62. The bushing 62 is sodimensioned that it slips readily over either end of the shank 5i andtightening of the thumb screw into a recess 54 secures the two shanks 50and 60 together so that the entire attachment may be easily maneuveredthrough desired work performing paths.

The shank 50 is precluded from twisting Within its aperture 52, andhence with respect to the other parts of the attachment, by reason of adiametrically extending aperture 68 through which extends another thumbor set screw 70. There is a vertically directed aperture 72 in the sidewall 16 having a larger diameter than the screw 70 so that there can becomplete freedom of movement therebetween, thereby permitting the thumbscrew td be-advancedsolelyby the'action of the threadscontained-intheaperture 68: Theaperturends-of sufficientlength so thatthe lower extremity of the screw 70 can' abut a portionof the barrel 24.Thus, a dual function iefieetedi the shanl 50 is prevented" from:turning and the barrel 24 s held fast Near the upper end of thethuni'b'sc'rew70 'is" a" collar Mane-a; washers/earth a coilspring78-intrp0sed thereuetwe'e The Washer'76 thus resilientlybearsagainst afyersly bent wire element'StY-haVing'a'pair of parallel spacedregs-s2, the ends of which are anchored to 'a shield 8'4 as by rivets 86(Fig; 3)"; The shield 84, to-

enie: W'ith'tlie Wire" 80',- fo'rihsan ei'r'ective guard capable ofoverhanging the saw 44* to'whatever extent that is desired by tlieusr'of the device; the resiliency imparted V bY-fthe'spring78-pe'rfiiitt-ing facile slidingof the wire 83 relative-to the s'idewall 16. Accordingly, it will be discerned that thet-humh'scre'w 76performs 'yet another t'unction;

In order to'gu'ide' the-entire attachmentin a rectilinearpatha-downwardly projecting flange 88 (Figs; 2 and 3) isp'rov'idedonthe' underside of the base plate 19. At one end o'f'the flange is anupstanding fixed post 90 having a notch en'gageable with onebeveled'en'd of the base plate, whereas an upstanding threaded stud 92is aflixed to the other'end. By'means ofa notched bushing 94'and atwingnut'96" the other beveledend of the base plate is releasably engaged.Simply loosening the Wing nut 96 permits struct'ion and many apparentlyWidely difierent embodiments of'thefl invention could be made withoutdeparting from the scope thereof, it is intended that allmattercontained in the above description or shown in the accompa'nyingdrawings shall be interpreted as illustrative and not-in a'lirfniting'sense.

It is also to be under sto'od that the language us'ed'in the followingclaims is intended to, cover all of the generic and specific features ofthe invention herein described and'all statements of the scope of theinvention which, as a matter of language, might be said to falltherebetween What is claimedz' y 1'. Ina woodworking attachment fordrill motors, a base plate, anupstanding side wall on said base platehaving a first cylindrical aperture extending transversely therethrough;a second aperture" extending longitudinally therethrough at an elevationdisplaced from said first aperture and a third apertufe extendingvertically in an inters cting relation with said first and secondapertures,

ical barrel received in said first aperture, a handle a cyli Jr shankreceived in said second aperture having a threaded aperture registrablewith said'thir'd'ape ture, a set screw threadedlyreceivedby'saidjthreadedaperture} said screw extending throughsaids'econd aperture into engagement with said barrel, a shaft journaledfor rotation within said barrel on an a'xis'ofiset from" the centerlineof said barrel, and a rotatableqwoodworking'tool carried by s'aid shaftfor rotation therewith, whereby angular adjustment of said barrel Withinsaid'first aperture determines the position of said tool relative tosaid base plate, and tightening of said set screw maintains suchadjustment 2. The structure set forth in claim l in which the handleshankprojects from both e'nds jof saidsidewa'll, a handlegrip'e'quipped'w'ith a bushing adapted to 'telescope over either end ofsaid handle'shanlt, said bushings;

having a threaded aperture extending radially inwardly, and a setscrew'threadedly' received by said last named aperture for retainingsaidhandlegrip in a fixed relation with respect to either end ofsaidshank;

a. The structure Barons inn'aim 1 in which said first named set screw isprovided with a collar, a washer'el-' men't circumscribing' said setscrew, a coil spring inter-' posed between said" collar and Washerelement, and a guard element for overlying the woodworking tool, saidguard eiernent having a'pair of spaced parallel legs dis posed in"transverse grooves atop said side wall with said Washer elementyieldingly bearing against said legs so as to retain frictionally theguard elementin a preferred position. 7

References- Cited in-thefile of this patent UNITED STATES PATENTS i

